Interstate 90 in Idaho

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This article is about the section of Interstate 90 in Idaho. For the entire route, see Interstate 90.

Interstate 90 marker

Interstate 90
Route information
Maintained by ITD
Length: 73.888 mi[1] (118.911 km)
Major junctions
West end: I‑90 at the Washington state line
East end: I‑90 at the Montana state line
Highway system

State Highways in Idaho

US-89 US-91

In the U.S. state of Idaho, Interstate 90 has a 74-mile-long (119 km) routing in the panhandle. Traveling east from Spokane, Washington, I-90 passes through Post Falls and Coeur d'Alene, over Fourth of July Summit, and through the Silver Valley before entering Montana at Lookout Pass.

I-90 is a major east-west route and the only freeway in northern Idaho.[2] I-90 is the third longest stretch of Interstate highway in Idaho. Interstate 84 and Interstate 15 are longer. Interstate 86 and Interstate 184 are shorter. I-90 is the only coast-to-coast Interstate in Idaho.

Route description[edit]

Interstate 90 enters Idaho and Kootenai County just east of the Spokane River bridge near the community of State Line, the smallest city in Idaho. It proceeds east through Post Falls to Coeur d'Alene, the county seat, and meets U.S. Route 95. I-90 turns southeast and passes north of downtown, which is accessible via an Interstate Business Loop, and Lake Coeur d'Alene. It continues east-southeast to Fourth of July Summit at an elevation of 3,081 feet (939 m) and down to Cataldo, home to the Old Cataldo Mission built 163 years ago in 1853.

Shortly after leaving Cataldo, I-90 enters Shoshone County and passes through or near the communities of Pinehurst, Kellogg, Osburn, Wallace, and Mullan. I-90 leaves the county and state at Lookout Pass at 4,725 feet (1,440 m)) and enters Montana.[2]

Eastbound I-90 on the 1991 viaduct
at Wallace in 2007


Interstate 90 through Idaho was formerly U.S. Route 10,[3] though some parts of I-90 were cut as new roadway.[4][5] The small town of Wallace in the Silver Valley still prides itself on having what was the last stoplight on I-90. Its downtown has many historical buildings, which would have been wiped out by the original planned route of the freeway,[6][7] so in 1976, city leaders had the downtown placed on the National Register of Historic Places.[8][9][10] Alternatives discussed in 1963 included tunnels and twin levels.[3][11]

As a result, the federal government was forced at great expense to reroute the freeway to the northern edge of downtown and elevate it. Work on that section was resumed in 1984,[12] and it opened in September 1991.[13] A bicycle path is routed beneath part of that segment. Before the move to the viaduct, I-90 went from a freeway at the western edge of Wallace, then turned to surface streets and followed the main arterial as U.S. Route 10 through town, which included the last stoplight on I-90 between Seattle and Boston.[14] Upon reaching the eastern edge of the town it became a limited access divided highway once again.[15]

The interstate also was routed along Lake Coeur d'Alene as a surface street before the Veterans Memorial Centennial Bridge was completed in the heights above the lake.

Exit list[edit]

County Location mi[1] km Exit[1] Destinations Notes
Kootenai 0.000 0.000 I‑90 west Continuation into Washington
Post Falls 1.160 1.867 1 Beck Road
2.080 3.347 2 Pleasant View Road
4.632 7.454 5 I-90 Business Loop east (Spokane Street) – City Center Exit is just east of northernmost point on I-90
5.450 8.771 6 I-90 Business Loop west (Seltice Way) – City Center Westbound exit and eastbound entrance
7.128 11.471 7 SH-41 north – Rathdrum, Spirit Lake
Coeur d'Alene 11.290 18.169 11 I-90 Business Loop east (Northwest Boulevard) – City Center
12.040 19.377 12 US-95 – Sandpoint, Moscow
12.560 20.213 13 4th Street
13.560 21.823 14 15th Street
14.780 23.786 15 I-90 Business Loop west (Sherman Avenue) – City Center
16.882 27.169 17 Mullan Trail Road
22.063 35.507 22 SH-97 south – Harrison, St. Maries
28.380 45.673 28 Fourth of July Pass Recreation Area
34.028 54.763 34 SH-3 south – Rose Lake, St. Maries, Harrison
39.024 62.803 39 Old Mission State Park
40.096 64.528 40 Cataldo
Shoshone 43.016 69.228 43 Kingston
45.261 72.841 45 Pinehurst, Smelterville
47.687 76.745 48 Smelterville, Shoshone County Airport
Kellogg 49.715 80.009 49 Bunker Avenue – Silver Mountain
50.321 80.984 50 Hill Street Eastbound exit and westbound entrance
50.551 81.354 51 Division Street – Wardner No westbound entrance
54.186 87.204 54 Big Creek
Osburn 57.036 91.791 57 I-90 Business Loop east – Osburn
59.553 95.841 60 I-90 Business Loop west – Silverton, Osburn
Wallace 60.990 98.154 61 I-90 Business Loop east – Wallace
61.948 99.696 62 I-90 Business Loop west / SH-4 east – Wallace, Burke
64.270 103.433 64 Golconda District
65.352 105.174 65 Compressor District
66.500 107.021 66 Gold Creek Eastbound exit and entrance
67.353 108.394 67 Morning District, West Mullan
Mullan 68.100 109.596 68 I-90 Business Loop east – Mullan Eastbound exit and westbound entrance
68.908 110.897 69 I-90 Business Loop west – Mullan, East Mullan
73.888 118.911 I‑90 east (Lookout Pass) Continuation into Montana
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

Related routes[edit]

Route map: Bing / Google

KML is from Wikidata


  1. ^ a b c "Milepoint Log Report" (PDF). Idaho Transportation Department. Retrieved July 11, 2015. 
  2. ^ a b Idaho Official Highway Map (2007 ed.), Boise, Idaho: Idaho Department of Transportation, 2007 
  3. ^ a b "Idaho eyes twin-level freeway". Spokane Daily Chronicle. Washington. Associated Press. December 18, 1963. p. 6. 
  4. ^ "Idaho seeking funds to buy right of way for freeway route". Spokane Daily Chronicle. Washington. February 1, 1957. p. a3. 
  5. ^ Leeright, Bob (July 31, 1971). "Displaced residents add to cost of highways". Spokane Daily Chronicle. Washington. Associated Press. p. 5. 
  6. ^ "Plans for Interstate 90 explained to Wallace CC". Spokane Daily Chronicle. Washington. January 23, 1970. p. 3. 
  7. ^ "Wallace Chamber seeks I-90 shift". Spokane Daily Chronicle. Washington. January 18, 1973. p. b3. 
  8. ^ "Wallace freeway hearing ordered by federal judge". Spokesman-Review. Spokane, Washington. Associated Press. July 23, 1976. p. 13. 
  9. ^ "I-90 study includes historic site survey". Spokane Daily Chronicle. Washington. January 10, 1980. p. 10. 
  10. ^ Collin, Matthew (January 26, 1981). "Wallace freeway 12 years overdue". Spokesman-Review. Spokane, Washington. p. 6. 
  11. ^ "Freeway alternatives reviewed for Wallace". Spokane Daily Chronicle. Washington. Associated Press. October 25, 1978. p. 5. 
  12. ^ Bond, Dave (July 18, 1984). "Wallace bypass work to start". Spokesman-Review. Spokane, Washington. p. 1. 
  13. ^ Idaho Transportation Department Archived September 26, 2006, at the Wayback Machine.
  14. ^ "He stalled Interstate 90 right in the middle of town". Eugene Register-Guard. Oregon. Associated Press. February 13, 1981. p. 15F. 
  15. ^ "Lone stoplight on Interstate 90 to pass by after new bypass". The Bulletin. Bend, Oregon. Associated Press. September 8, 1991. p. A9. 

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